src/v8/test/mjsunit/harmony/string-codepointat.js

   1 // Copyright 2014 the V8 project authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Flags: --harmony-strings
   6
   7 // Tests taken from:
   8 // https://github.com/mathiasbynens/String.prototype.codePointAt
   9
  10 assertEquals(String.prototype.codePointAt.length, 1);
  11 assertEquals(String.prototype.propertyIsEnumerable("codePointAt"), false);
  12
  13 // String that starts with a BMP symbol
  14 assertEquals("abc\uD834\uDF06def".codePointAt(""), 0x61);
  15 assertEquals("abc\uD834\uDF06def".codePointAt("_"), 0x61);
  16 assertEquals("abc\uD834\uDF06def".codePointAt(), 0x61);
  17 assertEquals("abc\uD834\uDF06def".codePointAt(-Infinity), undefined);
  18 assertEquals("abc\uD834\uDF06def".codePointAt(-1), undefined);
  19 assertEquals("abc\uD834\uDF06def".codePointAt(-0), 0x61);
  20 assertEquals("abc\uD834\uDF06def".codePointAt(0), 0x61);
  21 assertEquals("abc\uD834\uDF06def".codePointAt(3), 0x1D306);
  22 assertEquals("abc\uD834\uDF06def".codePointAt(4), 0xDF06);
  23 assertEquals("abc\uD834\uDF06def".codePointAt(5), 0x64);
  24 assertEquals("abc\uD834\uDF06def".codePointAt(42), undefined);
  25 assertEquals("abc\uD834\uDF06def".codePointAt(Infinity), undefined);
  26 assertEquals("abc\uD834\uDF06def".codePointAt(Infinity), undefined);
  27 assertEquals("abc\uD834\uDF06def".codePointAt(NaN), 0x61);
  28 assertEquals("abc\uD834\uDF06def".codePointAt(false), 0x61);
  29 assertEquals("abc\uD834\uDF06def".codePointAt(null), 0x61);
  30 assertEquals("abc\uD834\uDF06def".codePointAt(undefined), 0x61);
  31
  32 // String that starts with an astral symbol
  33 assertEquals("\uD834\uDF06def".codePointAt(""), 0x1D306);
  34 assertEquals("\uD834\uDF06def".codePointAt("1"), 0xDF06);
  35 assertEquals("\uD834\uDF06def".codePointAt("_"), 0x1D306);
  36 assertEquals("\uD834\uDF06def".codePointAt(), 0x1D306);
  37 assertEquals("\uD834\uDF06def".codePointAt(-1), undefined);
  38 assertEquals("\uD834\uDF06def".codePointAt(-0), 0x1D306);
  39 assertEquals("\uD834\uDF06def".codePointAt(0), 0x1D306);
  40 assertEquals("\uD834\uDF06def".codePointAt(1), 0xDF06);
  41 assertEquals("\uD834\uDF06def".codePointAt(42), undefined);
  42 assertEquals("\uD834\uDF06def".codePointAt(false), 0x1D306);
  43 assertEquals("\uD834\uDF06def".codePointAt(null), 0x1D306);
  44 assertEquals("\uD834\uDF06def".codePointAt(undefined), 0x1D306);
  45
  46 // Lone high surrogates
  47 assertEquals("\uD834abc".codePointAt(""), 0xD834);
  48 assertEquals("\uD834abc".codePointAt("_"), 0xD834);
  49 assertEquals("\uD834abc".codePointAt(), 0xD834);
  50 assertEquals("\uD834abc".codePointAt(-1), undefined);
  51 assertEquals("\uD834abc".codePointAt(-0), 0xD834);
  52 assertEquals("\uD834abc".codePointAt(0), 0xD834);
  53 assertEquals("\uD834abc".codePointAt(false), 0xD834);
  54 assertEquals("\uD834abc".codePointAt(NaN), 0xD834);
  55 assertEquals("\uD834abc".codePointAt(null), 0xD834);
  56 assertEquals("\uD834abc".codePointAt(undefined), 0xD834);
  57
  58 // Lone low surrogates
  59 assertEquals("\uDF06abc".codePointAt(""), 0xDF06);
  60 assertEquals("\uDF06abc".codePointAt("_"), 0xDF06);
  61 assertEquals("\uDF06abc".codePointAt(), 0xDF06);
  62 assertEquals("\uDF06abc".codePointAt(-1), undefined);
  63 assertEquals("\uDF06abc".codePointAt(-0), 0xDF06);
  64 assertEquals("\uDF06abc".codePointAt(0), 0xDF06);
  65 assertEquals("\uDF06abc".codePointAt(false), 0xDF06);
  66 assertEquals("\uDF06abc".codePointAt(NaN), 0xDF06);
  67 assertEquals("\uDF06abc".codePointAt(null), 0xDF06);
  68 assertEquals("\uDF06abc".codePointAt(undefined), 0xDF06);
  69
  70 assertThrows(function() {
  71   String.prototype.codePointAt.call(undefined);
  72 }, TypeError);
  73 assertThrows(function() {
  74   String.prototype.codePointAt.call(undefined, 4);
  75 }, TypeError);
  76 assertThrows(function() {
  77   String.prototype.codePointAt.call(null);
  78 }, TypeError);
  79 assertThrows(function() {
  80   String.prototype.codePointAt.call(null, 4);
  81 }, TypeError);
  82 assertEquals(String.prototype.codePointAt.call(42, 0), 0x34);
  83 assertEquals(String.prototype.codePointAt.call(42, 1), 0x32);
  84 assertEquals(String.prototype.codePointAt.call({
  85   toString: function() { return "abc"; }
  86 }, 2), 0x63);
  87 var tmp = 0;
  88 assertEquals(String.prototype.codePointAt.call({
  89   toString: function() { ++tmp; return String(tmp); }
  90 }, 0), 0x31);
  91 assertEquals(tmp, 1);